Product Introduction
The Bently Nevada 330709-000-070-50-12-00 3300 XL 11 mm Proximity Probes is designed for precise vibration and position monitoring in critical rotating machinery. This probe features a 5.0-meter (16.4 feet) cable, a miniature coaxial ClickLoc connector with FluidLoc cable, and an M16 x 1.5 thread without armor. Its polyphenylene sulfide (PPS) tip and AISI 304 stainless steel case ensure durability in harsh industrial environments. The 330709-000-070-50-12-00 is part of the trusted 3300 XL series, engineered to reduce common failure modes such as cable strain, cross-talk, and temperature-induced drift.
Technical Specifications Breakdown
| Parameter |
Value |
| Probe Length |
5.0 meters (with 70 mm overall case length) |
| Probe DC Resistance (RPROBE) |
7.2 ± 0.8 ohms (center to outer conductor) |
| Operating & Storage Temperature |
-52°C to +177°C (-62°F to +351°F) |
| Minimum Shaft Diameter (Flat Target) |
152 mm (6.0 inches) |
| Probe Case Thread |
M16 x 1.5 (max thread engagement: 24 mm) |
| Recommended Probe Case Torque |
21.1 N·m (187 in·lb) |
| Maximum Probe Case Torque |
63.3 N·m (560 in·lb) |
| Connector Torque (Max) |
0.565 N·m (5 in·lb) – finger tight |
| Minimum Bend Radius |
25.4 mm (1.0 inch) |
| Cross-talk Limitation (Flat Target Diam.) |
Minimum 30.5 mm (1.2 in) |
These specifications ensure accurate readings and prevent common issues like signal interference or mechanical damage. The 330709-000-070-50-12-00 is calibrated for use with the five-meter Proximitor sensor, delivering consistent performance.
Industry Applications
The Bently Nevada 330709-000-070-50-12-00 excels in monitoring steam turbines, centrifugal compressors, large pumps, and other rotating equipment. Its 11 mm tip provides reliable proximity sensing for radial vibration and thrust position. In high-temperature environments (up to +177°C), the probe maintains signal integrity. The cross-talk limitation of a 30.5 mm minimum flat target and 152 mm minimum shaft diameter ensures that multiple probes can be installed without interference—critical for dual-probe configurations.
Installation & Setup Guidance
Proper installation of the 330709-000-070-50-12-00 is key to avoiding failures. Thread the probe into the mounting hole using the M16 x 1.5 threads, ensuring no more than 24 mm of thread engagement. Apply recommended torque of 21.1 N·m (187 in·lb) to the probe case, never exceeding 63.3 N·m. Tighten the connector by hand only (0.565 N·m maximum) to avoid damaging the miniature coaxial ClickLoc connection. Keep cable bends to a minimum radius of 25.4 mm to prevent internal conductor breakage. Use the specified FluidLoc cable to resist oil and moisture ingress.
Troubleshooting & Common Issues
Common problems with proximity probes include cable wear, thermal drift, and cross-talk. The Bently Nevada 330709-000-070-50-12-00 addresses thermal performance through its temperature classification schedule (T1 to T5, and T2xx°C for EPL Dc). Avoid exposing the probe below -34°C (-30°F) to prevent premature pressure seal failure. For cross-talk, ensure flat targets are at least 30.5 mm in diameter and shaft diameters exceed 152 mm. If erratic readings occur, check the connector for torque (finger tight) and verify the 5.0-meter cable is paired with the correct 5-meter Proximitor sensor.
For reliable supply and expert support, contact UBEST Automation (available at ubest101.myshopify.com).